CMX649 CML Microcircuits, CMX649 Datasheet - Page 28

• Manufacturer Part Number: CMX649
• Description: ADM Codec
• Manufacturer: CML Microcircuits

ADM Codec
Dynamic Range
for Step Size
Integrator
(Bits 12 – 10)
Companding
Rule
(Bits 9 – 8)
Estimator
Integrator Time
Constant
(Bits 7 – 5)
Second Order
Estimator Time
Constant
(Bits 4 – 3)
2003 CML Microsystems Plc
Maximum and minimum step size are based on 16-bit word length (-32768 to
32767).
This is the number of consecutive ones or zeros that must occur for the step size to
be adjusted.
Allows selection of the estimator integrator time constant.
Allows selection of the second order estimator time constant.
Bit 12
0
0
0
0
1
1
1
1
Bit 4
Bit 7
0
0
1
1
0
0
0
0
1
1
1
1
Bit 11
0
0
1
1
0
0
1
1
Bit 9
0
0
1
1
Bit 3
Bit 6
0
1
0
1
0
0
1
1
0
0
1
1
Bit 10
0
1
0
1
0
1
0
1
Bit 8
0
1
0
1
N/A (selects first order estimator).
(Estimator Time Constant)/2
(Estimator Time Constant)/4
(Estimator Time Constant)/8
28
Time Constant (ms), Bit Rate in kbps
Bit 5
0
1
0
1
0
1
0
1
Maximum Step
Bluetooth compatible when
running at 64kbps.
10240
10240
5120
5120
2560
2560
1280
1280
16/(3*Bit Rate)
24/(3*Bit Rate)
32/(3*Bit Rate)
48/(3*Bit Rate)
64/(3*Bit Rate)
96/(3*Bit Rate)
Bluetooth compatible when
running at 64kbps.
128/(3*Bit Rate
192/(3*Bit Rate)
Companding Rule
Decay Time Constant (ms)
3 of 3
4 of 4
5 of 5
6 of 6
Bluetooth compatible
when running at 64kbps.
Minimum Step
20
10
20
10
20
10
20
10
CMX649
D/649/2